US4394982A - Liner plate for grinding mills - Google Patents
Liner plate for grinding mills Download PDFInfo
- Publication number
- US4394982A US4394982A US06/249,204 US24920481A US4394982A US 4394982 A US4394982 A US 4394982A US 24920481 A US24920481 A US 24920481A US 4394982 A US4394982 A US 4394982A
- Authority
- US
- United States
- Prior art keywords
- bar section
- lifter bar
- plate
- integral
- replaceable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/22—Lining for containers
Definitions
- This application pertains to the art of grinding mills and, more particularly, to liner plates for grinding mills.
- the invention is particularly applicable to liner plates for the end walls of grinding mills and will be described with reference thereto. However, it will be appreciated that features of the invention can be used for liner plates located in other areas of a grinding mill.
- Grinding mills include a shell having a generally cylindrical central wall and opposite end walls through which central inlet and discharge openings are provided for material processed in the mill.
- the inside of the shell is lined with replaceable liner plates which line the cylindrical wall and the inlet end walls have raised ribs commonly known as lifter bars for lifting material during rotation of the mill shell for achieving optimum grinding action.
- the lifter bars wear away as the material being ground slides therealong.
- the liner plates for the inlet end wall of the mill shell have a very low wear area on the lifter bars adjacent the intersection of the inlet end wall with the cylindrical central wall. This is at least partly due to the fact that the material being ground does not slide along the lifter bar in this area as much as such material slides along the full length of the bar.
- a replaceable lifter bar section extends over the remaining length of a liner plate, and additional bolts secure the replaceable lifter bar section and the liner plate to one another and to the shell. Removal of these latter bolts for replacement of the replaceable lifter bar section still leaves the liner plate securely held in position with the bolt extending through the integral lifter bar section.
- the liner plate and replaceable lifter bar section have cooperating surfaces shaped to provide a tongue and groove joint which resists lateral movement between the replaceable lifter bar section and the liner plate so that the lateral forces are not taken entirely by the bolts.
- a similar joint is provided between one end of the replaceable lifter bar section and an upstanding surface on the integral lifter bar section.
- FIG. 1 is a diagrammatic side cross-sectional elevational view of a grinding mill
- FIG. 2 is a partial cross-sectional elevational view taken generally on line 2--2 of FIG. 1;
- FIG. 3 is a view similar to FIG. 2 and showing a liner plate with a replaceable lifter bar section removed therefrom;
- FIG. 4 is a cross-sectional elevational view taken generally on line 4--4 of FIG. 3;
- FIG. 5 is a cross-sectional elevational view taken generally on line 5--5 of FIG. 4;
- FIG. 6 is a top plan view of a replaceable lifter bar section
- FIG. 7 is a side elevational view of the lifter bar of FIG. 6;
- FIG. 8 is an end elevational view taken generally on line 8--8 of FIG. 6;
- FIG. 9 is an elevational view of a typical bolt used with the liner plate and replaceable lifter bar of FIGS. 1-8;
- FIG. 10 is an end elevational view taken generally on line 10--10 of FIG. 9.
- FIG. 1 shows a grinding mill shell A having a generally cylindrical central wall 12, and generally conical opposite end walls 14, 16.
- Central cylindrical inlet and discharge openings 20, 22 are respectively provided in shell end walls 14, 16.
- the grinding mill is normally positioned with its longitudinal rotational axis 26 downwardly inclined slightly in a direction from inlet opening 20 toward discharge opening 22 so that material will flow through the mill during rotation thereof.
- the interior of grinding mill shell A is lined with liner plates in a known manner.
- the liner plates are removably mounted within the shell so they can be replaced as they wear out during use of the mill.
- the liner plates are normally of special construction and include such features as lifter ribs or bars for enhancing the grinding action of the mill.
- Material ground in the mill passes over and through a grate member 30 into a discharge end space 32 having at least one lifting vane 34 therein for lifting material from the bottom portion of discharge space 32 during rotation of the mill and causing same to flow through discharge opening 22.
- the internal liner plates for inlet end wall 14 commonly have generally radially extending lifter bars thereon for lifting the material being ground during rotation of the mill. As the material slides along and over these lifter bars, the bars become worn and require replacement. In previous arrangements, the liner plates and lifter bars have been constructed and secured to the shell in such a manner that removal of the bolts for replacement of the lifter bars also releases the liner plates from the shell. It has been found that the portion of a lifter bar located adjacent the intersection of central wall 12 and inlet end wall 14 is subjected to very low wear. Therefore, it has been found that it is possible to construct the liner plates for inlet end wall 14 with an integral lifter bar section located adjacent the intersection of central wall 12 with inlet end wall 14.
- This integral lifter bar section receives a securing bolt for holding the entire liner plate in position while the remaining of the lifter bar is in the form of a removable lifter bar section which can be replaced without releasing its liner plate from the shell. Therefore, the liner plates can also be constructed to extend from the inlet opening 20 to the intersection of central wall 12 with inlet end wall 14.
- FIG. 2 shows a liner plate B which may be considered to have the general shape of an equilateral trapezoid with long and short opposite ends 40, 42, and opposite sides 44. Opposite ends 40, 42 are curved to generally correspond with the curvature of inlet opening 20 and with the shell at the intersection of central wall 12 with inlet end wall 14. A plurality of the liner plates B are positionable side-by-side to completely line the interior of inlet end wall 14.
- Liner plate B has opposite front and rear surfaces 50, 52 as best shown in FIG. 4.
- Rear surface 52 is outwardly curved between opposite sides 44 to lie generally on the surface of a cone corresponding to the internal conical surface of inlet end wall 14.
- Integral lifter bar section C is cast integral with liner plate B adjacent long end 40 thereof. Integral lifter bar section C has a length which is approximately one-fourth the length of plate B between long and short ends 40, 42 thereof. Integral lifter bar section C has a width adjacent its opposite ends which is less than the width thereof intermediate its ends. Thus, the opposite sides of integral lifter bar section C are undulating. The mean width of integral lifter bar section C is approximately one-fourth the length of long end 40. Integral lifter bar section C is approximately centered on the centerline of plate B between opposite sides 44. A substantially central bolt receiving hole 56 extends through integral lifter bar section C substantially perpendicular to plate B.
- Integral lifter bar section C has an upstanding surface 58 extending substantially perpendicular to plate B and facing toward short plate end 42. Upstanding surface 58 is shaped to provide a central tongue 60 projecting outwardly therefrom toward short plate end 42. As shown in FIG. 5, tongue 60 and upstanding surface 58 intersect front surface 50 of plate B at a smoothly curved radius generally indicated at 62. Integral lifting lugs 64 extend upwardly from front surface 50 of plate B and holes are provided therethrough for receiving hooks in a known manner.
- Plate B has an elongated groove 68 in front surface 50 thereof extending from integral lifter bar section C to plate short end 42.
- Circular bolt receiving holes 70 are longitudinally spaced along groove 68.
- FIGS. 6-8 show a replaceable lifter bar section D having opposite ends 74, 76, top and bottom surfaces 78, 80 and opposite sides 82, 84.
- the length of replaceable lifter bar section D between opposite ends 74, 76 thereof is substantially the same as the distance from short plate end 42 to upstanding surface 58 on integral lifter bar section C.
- End 76 of replaceable lifter bar section D is shaped to provide a vertical groove 86 thereon for closely receiving tongue 60 on integral lifter bar section C.
- a central tongue 90 projects downwardly from bottom surface 80 and is dimensioned for close reception in groove 68 of plate B.
- the intersections between bottom surface 80 and end 76, and between tongue 90 and groove 86 are smoothly curved to correspond with curvature 62 in FIG. 5.
- replaceable lifter bar section D is substantially the same as the width of integral lifter bar section C.
- Integral lifting lugs 94 having holes therethrough are provided on the opposite sides of replaceable lifter bar section D.
- Longitudinally-spaced bolt receiving holes 96 extend through replaceable lifter bar section D and are aligned with bolt receiving holes 70 in plate B when lifter bar section D is positioned on plate B with tongue 60 received in groove 86.
- holes 90 have upper portions of generally oval cross-sectional shape merging into cylindrical hole portions 102 along an inwardly inclined surface 104.
- Hole 56 in integral lifter bar section C is correspondingly shaped.
- This type of hole is known per se in liner plates and lifter bars, and receives a bolt indicated at E in FIGS. 9 and 10 having an oval upper head 106 corresponding to the cross-sectional shape of the oval upper portion of the bolt receiving holes.
- Oval head 106 merges along an inclined surface 108 into a cylindrical bolt shank 110 which extends through the cylindrical portion of the bolt receiving holes and also extends through suitable holes in mill shell A for receiving nuts.
- Bolt heads 106 are relatively short in length so that the bolt heads are recessed well below the outer surfaces of the integral or replaceable lifter bar sections. As the lifter bar sections wear away, the integrity of the fastening is maintained because the bolt heads are recessed well below the outer surfaces of the lifter bar sections.
- Replaceable lifter bar section D has projections 112 extending outwardly from sides 82, 84 in alignment with bolt receiving holes 96. This arangement provides opposite sides 84, 84 with an undulating shape for enhancing grinding action.
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
Claims (15)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/249,204 US4394982A (en) | 1981-03-30 | 1981-03-30 | Liner plate for grinding mills |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/249,204 US4394982A (en) | 1981-03-30 | 1981-03-30 | Liner plate for grinding mills |
Publications (1)
Publication Number | Publication Date |
---|---|
US4394982A true US4394982A (en) | 1983-07-26 |
Family
ID=22942471
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/249,204 Expired - Fee Related US4394982A (en) | 1981-03-30 | 1981-03-30 | Liner plate for grinding mills |
Country Status (1)
Country | Link |
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US (1) | US4394982A (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4770276A (en) * | 1986-04-23 | 1988-09-13 | Mazda Motor Corporation | Oil pan for automotive engine |
US4848681A (en) * | 1987-06-02 | 1989-07-18 | Skega Ab | Wear resistant element included in a mill lining |
US4886218A (en) * | 1988-12-21 | 1989-12-12 | Cae Machinery Ltd. | Mantle with replaceable wear plates |
US5390866A (en) * | 1992-09-22 | 1995-02-21 | Prima Industria Holdings (Proprietary) Ltd. | Mill drum |
US5472148A (en) * | 1992-01-10 | 1995-12-05 | Envirotech Pumpsystems, Inc. | Grinding mill, lining and associated method of manufacture |
WO2009121129A1 (en) * | 2008-04-01 | 2009-10-08 | Weir Minerals Australia Ltd | A lifter bar assembly for a crushing mill and method of installation |
WO2011130781A1 (en) * | 2010-04-19 | 2011-10-27 | Vulco S.A. | A wear plate system, arrangement and method |
EP2394741A1 (en) * | 2010-06-02 | 2011-12-14 | Stahlwerke Bochum GmbH | Tool insert for a device for grinding lump material and device comprising such an insert |
WO2012079123A2 (en) * | 2010-12-14 | 2012-06-21 | Weir Minerals Australia Ltd | Lifter bar with attachment point for hoisting |
CN103990521A (en) * | 2014-05-26 | 2014-08-20 | 顾开明 | Spliced type end lining plate |
US9415395B2 (en) | 2010-04-19 | 2016-08-16 | Vulco S.A. | Wear plate fastening system, arrangement and method |
US20200122155A1 (en) * | 2018-10-19 | 2020-04-23 | Outotec (Finland) Oy | Grinding mill |
US20230356234A1 (en) * | 2018-08-16 | 2023-11-09 | Bradken Resources Pty Limited | Mill liner, coupling tool and method of removal of a mill liner |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4270705A (en) * | 1978-08-11 | 1981-06-02 | Minneapolis Electric Steel Castings Company | Shell liner assembly for ore grinding mills |
-
1981
- 1981-03-30 US US06/249,204 patent/US4394982A/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4270705A (en) * | 1978-08-11 | 1981-06-02 | Minneapolis Electric Steel Castings Company | Shell liner assembly for ore grinding mills |
Cited By (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4770276A (en) * | 1986-04-23 | 1988-09-13 | Mazda Motor Corporation | Oil pan for automotive engine |
US4848681A (en) * | 1987-06-02 | 1989-07-18 | Skega Ab | Wear resistant element included in a mill lining |
US4886218A (en) * | 1988-12-21 | 1989-12-12 | Cae Machinery Ltd. | Mantle with replaceable wear plates |
US5472148A (en) * | 1992-01-10 | 1995-12-05 | Envirotech Pumpsystems, Inc. | Grinding mill, lining and associated method of manufacture |
US5390866A (en) * | 1992-09-22 | 1995-02-21 | Prima Industria Holdings (Proprietary) Ltd. | Mill drum |
US9266111B2 (en) | 2008-04-01 | 2016-02-23 | Weir Minerals Australia Ltd. | Lifter bar assembly for a crushing mill and method of installation |
US8746601B2 (en) | 2008-04-01 | 2014-06-10 | Weir Minerals Australia, Ltd. | Lifter bar assembly for a crushing mill and method of installation |
EA026603B1 (en) * | 2008-04-01 | 2017-04-28 | Уиэр Минералз Острейлиа Лтд. | Lifter bar assembly for a crushing mill and method of assembling same |
US20110220752A1 (en) * | 2008-04-01 | 2011-09-15 | Terry Cox | Lifter bar assembly for a crushing mill and method of installation |
WO2009121129A1 (en) * | 2008-04-01 | 2009-10-08 | Weir Minerals Australia Ltd | A lifter bar assembly for a crushing mill and method of installation |
AP3373A (en) * | 2008-04-01 | 2015-07-31 | Weir Minerals Australia Ltd | A lifter bar assembly for a crushing mill and method of installation |
CN101980787B (en) * | 2008-04-01 | 2012-11-21 | 伟尔矿物澳大利亚私人有限公司 | A lifter bar assembly for a crushing mill and method of installation |
EA021505B1 (en) * | 2008-04-01 | 2015-07-30 | Уиэр Минералз Острейлиа Лтд. | A lifter bar assembly for a crushing mill and method of retro-fitting same |
AU2009230873C1 (en) * | 2008-04-01 | 2015-01-22 | Weir Minerals Australia Ltd | A lifter bar assembly for a crushing mill and method of installation |
AU2009230873B2 (en) * | 2008-04-01 | 2013-06-13 | Weir Minerals Australia Ltd | A lifter bar assembly for a crushing mill and method of installation |
AP3896A (en) * | 2010-04-19 | 2016-11-15 | Vulco Sa | A wear plate system, arrangement and method |
US9375722B2 (en) | 2010-04-19 | 2016-06-28 | Vulco S.A. | Wear plate system, arrangement and method |
WO2011130781A1 (en) * | 2010-04-19 | 2011-10-27 | Vulco S.A. | A wear plate system, arrangement and method |
CN102947004B (en) * | 2010-04-19 | 2014-11-05 | 乌尔可公司 | Grinding miller,wear plate for a grinding mill discharge head, and manufacturing and installing method of wear plate |
EA025446B1 (en) * | 2010-04-19 | 2016-12-30 | Вулко С.А. | Wear plate for a grinding mill discharge head and method of manufacturing the same |
US9415395B2 (en) | 2010-04-19 | 2016-08-16 | Vulco S.A. | Wear plate fastening system, arrangement and method |
CN102947004A (en) * | 2010-04-19 | 2013-02-27 | 乌尔可公司 | A wear plate system, arrangement and method |
EP2394741A1 (en) * | 2010-06-02 | 2011-12-14 | Stahlwerke Bochum GmbH | Tool insert for a device for grinding lump material and device comprising such an insert |
AU2011342373B2 (en) * | 2010-12-14 | 2013-05-23 | Weir Minerals Australia Ltd | Lifter bar with attachment point for hoisting |
WO2012079123A2 (en) * | 2010-12-14 | 2012-06-21 | Weir Minerals Australia Ltd | Lifter bar with attachment point for hoisting |
WO2012079123A3 (en) * | 2010-12-14 | 2012-08-23 | Weir Minerals Australia Ltd | Lifter bar with attachment point for hoisting |
CN104475201A (en) * | 2010-12-14 | 2015-04-01 | 伟尔矿物澳大利亚私人有限公司 | Tool used for raising lifter rods, lifter and attached method |
CN103370136A (en) * | 2010-12-14 | 2013-10-23 | 伟尔矿物澳大利亚私人有限公司 | Lifter bar with attachment point for hoisting |
CN103370136B (en) * | 2010-12-14 | 2015-01-07 | 伟尔矿物澳大利亚私人有限公司 | Lifter bar with attachment point for hoisting |
US9533309B2 (en) | 2010-12-14 | 2017-01-03 | Weir Minerals Australia Ltd. | Lifter bar with attachment point for hoisting |
EA031283B1 (en) * | 2010-12-14 | 2018-12-28 | Уэйр Минералз Острэйлиа Лтд | Lifter bar for use in crushing mills |
CN103990521A (en) * | 2014-05-26 | 2014-08-20 | 顾开明 | Spliced type end lining plate |
US20230356234A1 (en) * | 2018-08-16 | 2023-11-09 | Bradken Resources Pty Limited | Mill liner, coupling tool and method of removal of a mill liner |
US20200122155A1 (en) * | 2018-10-19 | 2020-04-23 | Outotec (Finland) Oy | Grinding mill |
US10967384B2 (en) * | 2018-10-19 | 2021-04-06 | Outotec (Finland) Oy | Grinding mill |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: MIDLAND-ROSS CORPORATION, CLEVELAND, OH, A CORP. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WILSON CLIVE J.;REEL/FRAME:003856/0882 Effective date: 19810309 |
|
FEPP | Fee payment procedure |
Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
AS | Assignment |
Owner name: SAUDI INTERNATIONAL BANK, AL-BANK AL-SAUDI AL-ALAM Free format text: SECURITY INTEREST;ASSIGNOR:CAPITOL CASTINGS ACQUISITION, INC., A CORP OF DE.;REEL/FRAME:004688/0691 Effective date: 19870331 Owner name: CAPITOL CASTINGS ACQUISITION, INC., 25 ECKER STREE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MIDLAND-ROSS CORPORATION, A DE. CORP.;REEL/FRAME:004689/0766 Effective date: 19870330 |
|
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 19870712 |
|
AS | Assignment |
Owner name: CAPITOL CASTINGS, INC., 5857 SOUTH KYRENE ROAD, TE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FL AEROSPACE CORP.;REEL/FRAME:004936/0216 Effective date: 19880805 |
|
AS | Assignment |
Owner name: SAUDI INTERNATIONAL BANK, AL-BANK AL-SAUDI AL-ALAM Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CAPITOL CASTINGS ACQUISITION, INC.;REEL/FRAME:004979/0144 Effective date: 19881031 |